/*
 * Copyright (C) 2009 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import java.util.Collection;
import java.util.List;

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * GWT emulated version of {@link ImmutableList}. TODO(cpovirk): more doc
 *
 * @author Hayward Chan
 */
abstract class ForwardingImmutableList<E> extends ImmutableList<E>
{

    ForwardingImmutableList()
    {
    }

    abstract List<E> delegateList();

    public int indexOf(@Nullable Object object)
    {
        return delegateList().indexOf(object);
    }

    public int lastIndexOf(@Nullable Object object)
    {
        return delegateList().lastIndexOf(object);
    }

    public E get(int index)
    {
        return delegateList().get(index);
    }

    public ImmutableList<E> subList(int fromIndex, int toIndex)
    {
        return unsafeDelegateList(delegateList().subList(fromIndex, toIndex));
    }

    @Override
    public Object[] toArray()
    {
        // Note that ArrayList.toArray() doesn't work here because it returns E[]
        // instead of Object[].
        return delegateList().toArray(new Object[size()]);
    }

    @Override
    public boolean equals(Object obj)
    {
        return delegateList().equals(obj);
    }

    @Override
    public int hashCode()
    {
        return delegateList().hashCode();
    }

    @Override
    public UnmodifiableIterator<E> iterator()
    {
        return Iterators.unmodifiableIterator(delegateList().iterator());
    }

    @Override
    public boolean contains(@Nullable Object object)
    {
        return object != null && delegateList().contains(object);
    }

    @Override
    public boolean containsAll(Collection<?> targets)
    {
        return delegateList().containsAll(targets);
    }

    public int size()
    {
        return delegateList().size();
    }

    @Override
    public boolean isEmpty()
    {
        return delegateList().isEmpty();
    }

    @Override
    public <T> T[] toArray(T[] other)
    {
        return delegateList().toArray(other);
    }

    @Override
    public String toString()
    {
        return delegateList().toString();
    }
}
